makeroads.R and process.R are lightly commented. Place them in the
same directory (and cd there), edit process.R to your liking, then use:

R -f process.R

You'll get a bunch of GPX files named 'roadway-*.gpx', one per
identified track, along with Rplots.pdf containing a visual
representation of each estimated track along with the tracks that were
used to construct it.

Recent Changes

This version uses rgeos to ridiculously improve the time taken to
match the tracks. (Data matching now takes an order of minutes
versus hours in previous versions.)